Ventilator for greenhouses.



G. B. AKDEESGH.

TEATOB. BOB GREENHOUSE.

A LIUATIOE FILED IEB.1,1909.

919,673. Patented Apr. 27, 1909.

2 SHEETS-SHEET 1.

I/ v v 5 s1 mces e 21; Z a zg janczierso r/ G. B. ANDERSON. VENTILATCRFOR GREENHOUSES.

APPLICATION FILED I'EB.1,1909.

Patented Apr. 27, 1909.

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE. GEORGE B. A NDERSO'N, OF HYDE PARK,-MASSACHUSETTS, ASSIGNOR TO JAMES M. i

FARQUHAR, OF BOSTON, MASSACHUSETTS.

VENTILATOR FOR GREENHOUSES.

Specification of Letters Patent.

Patented April27, 1909.

Application filed February 1, 1909. Serial No. 476,323;

To all whom it may concern:

Be it known that I, GEORGE B. ANDERSON,

a citizen of the United States, residing at like parts.

This invention relates to ventilators for greenhouses, and has for oneof its objects to provide a novel mechanism by which the swinging sasheson each side of the greenhouse roof may be 0 erated eithersimultaneously or inde en ently from a single shaft, and for anot er ofits objects to provide a novel construction whereby the sashes maybelocked in their open or closed position.

One embodiment of my invention will first be described and then thenovel features will be ointed out in the appended claims.

'eferring to the drawings wherein I have illustrated said embodiment ofmy invention, Figure 1 is a vertical section through a greenhouseshowing my improved ventilating device; Fig. 2 is a section on the linexr, Fig. 1; Fig. 3 is a side view of the ventilating apparatus, Fig. 4is a section on the line g 'y,

in the drawings 3 represents the roof of the greenhouse and 4, 4 reresent the swinging sashes with which gree houses'are usuaily equipped."These swinging sashes are common y hinged to the peak of the roof, asat 5, and are adapted to swing upwardly away from the rafters forventilation purposes, as shown at the right hand in Fig. 1, or areadapted to be swung down into contact with the rafters for closing theventilating -open ings, as shown at the left hand in Fig. 1. Each sashis shown as having pivoted thereto a link 6 which is pivoted to an arm 7that is fast on a shaft 9 that runs longitudinally of the roof and isjournaled in suitable bearings 90. Each shaft has thereon a segmentalworm gear (said gears being designated 8 and '8) which is adapted tomesh with and be driven by a worm 11 carried by a vertical shaft 12 thatis 0 erated from a handle 13 through suitable evel gears 91, 92, and isjournaled in suitable bearings 38. The turning of the handle 13 operatesto turn the shaft 9 thereby to raise or lower the swinging sashconnected therewith; lhis construction is such as is commonly providedin eenhouses. Heretofore, however, it has een customary to provide. anoperating mechanism such as above described for eac of the swingingsashes, so that one handle 13 and its corresponding vertical shaft 12 isused for raising or lowerin the sash on one side of the ridge ole or peaof the roof, and another similar if used for raising or lowering thesash on the other side of said peak. One of the objects of my inventionisto provide a novel construction whereby both of the sashes can be.operated from the same vertical shaft and may be operated eithersimultaneously or separately as desired. I acoom lish this end y placingthe shaft 12, centra 1y between the two worm gears'S and 8 and arrangingthe worm 11 so that it is adapted to mes 'with both of. said worm gears.Where this construction is ado ted the rotation'of the shaft 12 willrotate 0th worm gears, and, therefore, the two sashes 4' and 4 may beoperated simultaneously. 0

It is often necessary, however, to raise one sash without raising theother or to otherwise operate the sashes independentl from each other.My invention contemplhtes a construction by which this may be done, and5' in the present embodiment I accomplish it by arrangin the ears 8 and8' so that they may at wil be isconnected from orconnected to the worm11. This end is secured by splining the worm,gears 8 and 8 to the shafts9 so that said gears may be moved longitudinally of the shafts therebyto carry the teeth thereof into or out'of mesh from the worm 11.

In Fi s. 3 and 4, the worm gear 8 is moved longitudinally so as to bedisconnected from the worm 11 while the worm gear 8 is still in meshwith the worm. Where the parts are in these positions, operation of thehandle 13 will raise or: lower the sash 4 but will give 10o no movementto the sash 4. (in the other hand, when the gear 8 is in mesh with theworm 11, but the gear 8 is thrown out of mesh therewith, then movementof the handle 13 will operate the sash 4. 8 and 8' may be shiftedlongitudinally in any suitable way. I have, however, shown for thispurpose two levers 15 and 15 which are pivoted to brackets or arms 16and are forked at their upper ends to engage in grooves 17 110 andle andvertical shaft is q The gears vented from rotation.

formed in the hubs 18 of the gears. I have also shown these. handles asextending.

through keepers 20 which are provided with notches 21 to lock the levers15, 15 in either position desired. My invention also contemplates aconstruction whereby when either gear is disconnected from the worm itmay be locked and pre- This lock is herein shown as comprising a pin orprojection extending from the face of the gear-which is adapted to enage an abutment 31. When the gears 8 an 8 are shifted into a position tomesh with the worm 11, the stop pins or projections .30 are withdrawnfrom the abutments so as to permit the gears to freely turn. When theears 8 and 8 are thrown 1 out of meshwith t e worm, the stop pins 30 vby arms constituting .of sai bracket having to engage-the top edge of anarm of the bracket. whenthe gear carrying the pin is disconnected'fromthe Worm 11. The con-' struction is also such that if the sash ispartially raised, as shown at the right Fig. 1, and the correspondinggear is disconnected from the worm, the in 30 carried by said gear willengage the un erside of an arm of the bracket 60 and thus lock the sashopen. It will be noted, however, that the locks are only operative whenthe gears are disconnected from the worm 7. When the gears are in meshwith the worm the pins 30 are withdrawn from the abutments.

The bracket 60 is shown as secured to a sleeve 61 which surrounds theshaft 12 and this sleeve 61 also constitutes the support to which thebearing 16 and keepers 20 are secured.

From'the above it will'beseen that .my

I construction permits the sashes 4,.4 to be as desired and alsoprovides or 100 operated either simultaneousl or sepfilratialy g thesashes either in their open or closed positions.

. While I have illustrated herein one embodiment of my invention, Idonot wish to be limited to the construction shown, as various changesin the shape and configuration of the parts maybe made without departingfrom the invention.

Having fully described my invention, What I claim as new and desire tosecure by Letters Patent is 1Q In a ventilator for greenhouses, thecombination with two swinging sashes, of a worm gear for o crating eachsash, a worm common to I both gears, and an o erating shaft on whichsaid worm is mountec 2. In a ventilator for greenhouses, the combinationwith two swinging sashes, of a wormgear for operating each sash, a wormcommon to both gears, a vertically-arranged shaft on which said worm ismounted, and

' means to disconnect either worm gear from said worm.

3. In a ventilator for greenhouses, the

combination with two swinging sashes, of a worm gear for operating eachsash, a worm comgnon to both gears, a vertically-arranged shaft on whichsaid worm is mounted, and means to disconnect either worm gear from saidworm and lock said gear from movement.- I

4; In a ventilator for greenhouses, the

combination with two swingmg sashes, of a shaft extending longitudina lyof each sash, a worm gear on each shaft and connected to the. corresonding sash, a'vertically-arranged shaft, an a worm thereon adapted tomesh with and drive each of the worm gears, each worm gear beingslidably mounted on .its shaft to permit it to be disconnected from theworm.

5. In a ventilator for greenhouses, the combination with'two swingingsashes, of a shaft extendinglongitudinally of each sash, a worm gear oneach shaft and connected to the corresponding sash, avertically-arranged shaft, a worm thereon adapted to mesh with and driveeach of the worm gears, each worm gear being slidably mounted on itsshaft to permit it to be disconnected from the worm,

and a lever forcontrolling the position of eachworm gear on its shaft.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnes ses.- GEORGE B. ANDERSON.I'Vitnesses:

LOUIS C, SMITH,. THOMAS J. DRUMMOND.

